What do flashing red lights on a school bus indicate?

You must pass the school bus.
The bus is about to stop.
The bus is stopped to load or discharge passengers.
Traffic that approaches from either direction may proceed.
Explanation

When a stopped school bus is flashing its red lights, it indicates that the bus is loading or discharging passengers. You must come to a stop and may only proceed once the red lights have stopped flashing. Watch for children crossing the road in front of, or behind the school bus.

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